Just in case let me repeat, I can be easily wrong because I forgot how this series actually look and I don't have the patches now ;)
On 11/09, Frederic Weisbecker wrote: > > On Sat, Nov 09, 2013 at 04:11:56PM +0100, Oleg Nesterov wrote: > > On 11/08, Frederic Weisbecker wrote: > > > > > > > > > Does this feature only work on data breakpoint or is instruction > > > breakpoint > > > address range supported as well? > > > > IIRC, execute range is supported as well. > > > > But. I can't look at the code now, but iirc this can't really work until > > we fix the (already discussed) problems with bp_len && X86_BREAKPOINT_LEN_X. > > IOW, we should not blame these patches if it doesn't work. > > Yeah, don't worry I don't plan to push back these patches for the sake of > that bug, > that would be definetly unfair, especially as I introduced that issue :) > > And the patchset looks good overall, except for a few details but it's mostly > ok, OK, > I just would like to fix that issue along the way. It would be really nice if > we can > avoid having a mask _and_ a len for breakpoints. Up to you and Suravee, but can't we cleanup this later? This series was updated many times to address a lot of (sometimes contradictory) complaints. > I mean, that doesn't look right to me, > it's two units basically measuring the same thing, so that's asking for > conflicting troubles. Yes. And we can kill either _len or _mask, not sure what would be more clean. At least with the current implementation (again, iirc) mask == len -1. Although amd supports the more generic masks (but I can't recall the details). > I'm just not sure how to reuse the len to express breakpoint ranges (that was > in fact the > initial purpose of it) without breaking the tools. Confused... user-space still uses len to express the range? Just the kernel "switches" to mask if len > 8 ? Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
